git.sesse.net Git - vlc/blob - modules/demux/mpeg/ps.c

   1 /*****************************************************************************
   2  * ps.c : Program Stream input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000-2001 VideoLAN
   5  * $Id: ps.c,v 1.4 2002/08/12 22:48:18 massiot Exp $
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <stdlib.h>                                      /* malloc(), free() */
  28 #include <string.h>                                              /* strdup() */
  29 #include <errno.h>
  30
  31 #include <vlc/vlc.h>
  32 #include <vlc/input.h>
  33
  34 #include <sys/types.h>
  35
  36 #include "system.h"
  37
  38 /*****************************************************************************
  39  * Constants
  40  *****************************************************************************/
  41 #define PS_READ_ONCE 50
  42
  43 /*****************************************************************************
  44  * Private structure
  45  *****************************************************************************/
  46 struct demux_sys_t
  47 {
  48     module_t *   p_module;
  49     mpeg_demux_t mpeg;
  50 };
  51
  52 /*****************************************************************************
  53  * Local prototypes
  54  *****************************************************************************/
  55 static int  Activate   ( vlc_object_t * );
  56 static void Deactivate ( vlc_object_t * );
  57 static int  Demux      ( input_thread_t * );
  58
  59 /*****************************************************************************
  60  * Module descriptor
  61  *****************************************************************************/
  62 vlc_module_begin();
  63     set_description( _("ISO 13818-1 MPEG Program Stream input") );
  64     set_capability( "demux", 1 );
  65     set_callbacks( Activate, Deactivate );
  66     add_shortcut( "ps" );
  67 vlc_module_end();
  68
  69 /*****************************************************************************
  70  * Activate: initialize PS structures
  71  *****************************************************************************/
  72 static int Activate( vlc_object_t * p_this )
  73 {
  74     input_thread_t *    p_input = (input_thread_t *)p_this;
  75     demux_sys_t *       p_demux;
  76     byte_t *            p_peek;
  77
  78     /* Set the demux function */
  79     p_input->pf_demux = Demux;
  80
  81     /* Initialize access plug-in structures. */
  82     if( p_input->i_mtu == 0 )
  83     {
  84         /* Improve speed. */
  85         p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
  86     }
  87
  88     /* Have a peep at the show. */
  89     if( input_Peek( p_input, &p_peek, 4 ) < 4 )
  90     {
  91         /* Stream shorter than 4 bytes... */
  92         msg_Err( p_input, "cannot peek()" );
  93         return -1;
  94     }
  95
  96     if( *p_peek || *(p_peek + 1) || *(p_peek + 2) != 1 )
  97     {
  98         if( *p_input->psz_demux && !strncmp( p_input->psz_demux, "ps", 3 ) )
  99         {
 100             /* User forced */
 101             msg_Err( p_input, "this does not look like an MPEG PS stream, continuing" );
 102         }
 103         else
 104         {
 105             msg_Warn( p_input, "this does not look like an MPEG PS stream, "
 106                                "but continuing anyway" );
 107         }
 108     }
 109     else if( *(p_peek + 3) <= 0xb9 )
 110     {
 111         if( *p_input->psz_demux && !strncmp( p_input->psz_demux, "ps", 3 ) )
 112         {
 113             /* User forced */
 114             msg_Err( p_input, "this seems to be an elementary stream (ES module?), but continuing" );
 115         }
 116         else
 117         {
 118             msg_Warn( p_input, "this seems to be an elementary stream (ES module?), but continuing" );
 119         }
 120     }
 121
 122     p_demux = p_input->p_demux_data = malloc( sizeof(demux_sys_t ) );
 123     if( p_demux == NULL )
 124     {
 125         return -1;
 126     }
 127
 128     p_input->p_private = (void*)&p_demux->mpeg;
 129     p_demux->p_module = module_Need( p_input, "mpeg-system", NULL );
 130     if( p_demux->p_module == NULL )
 131     {
 132         free( p_input->p_demux_data );
 133         return -1;
 134     }
 135
 136     if( input_InitStream( p_input, sizeof( stream_ps_data_t ) ) == -1 )
 137     {
 138         module_Unneed( p_input, p_demux->p_module );
 139         free( p_input->p_demux_data );
 140         return -1;
 141     }
 142     input_AddProgram( p_input, 0, sizeof( stream_ps_data_t ) );
 143
 144     p_input->stream.p_selected_program =
 145             p_input->stream.pp_programs[0] ;
 146
 147     if( p_input->stream.b_seekable )
 148     {
 149         stream_ps_data_t * p_demux_data =
 150              (stream_ps_data_t *)p_input->stream.pp_programs[0]->p_demux_data;
 151
 152         /* Pre-parse the stream to gather stream_descriptor_t. */
 153         p_input->stream.pp_programs[0]->b_is_ok = 0;
 154         p_demux_data->i_PSM_version = EMPTY_PSM_VERSION;
 155
 156         while( !p_input->b_die && !p_input->b_error
 157                 && !p_demux_data->b_has_PSM )
 158         {
 159             ssize_t             i_result;
 160             data_packet_t *     p_data;
 161
 162             i_result = p_demux->mpeg.pf_read_ps( p_input, &p_data );
 163
 164             if( i_result == 0 )
 165             {
 166                 /* EOF */
 167                 vlc_mutex_lock( &p_input->stream.stream_lock );
 168                 p_input->stream.pp_programs[0]->b_is_ok = 1;
 169                 vlc_mutex_unlock( &p_input->stream.stream_lock );
 170                 break;
 171             }
 172             else if( i_result == -1 )
 173             {
 174                 p_input->b_error = 1;
 175                 break;
 176             }
 177
 178             p_demux->mpeg.pf_parse_ps( p_input, p_data );
 179             input_DeletePacket( p_input->p_method_data, p_data );
 180
 181             /* File too big. */
 182             if( p_input->stream.p_selected_area->i_tell >
 183                                                     INPUT_PREPARSE_LENGTH )
 184             {
 185                 break;
 186             }
 187         }
 188         input_AccessReinit( p_input );
 189         p_input->pf_seek( p_input, (off_t)0 );
 190         vlc_mutex_lock( &p_input->stream.stream_lock );
 191
 192         if( p_demux_data->b_has_PSM )
 193         {
 194             /* (The PSM decoder will care about spawning the decoders) */
 195             p_input->stream.pp_programs[0]->b_is_ok = 1;
 196         }
 197 #ifdef AUTO_SPAWN
 198         else
 199         {
 200             /* (We have to do it ourselves) */
 201             int                 i_es;
 202
 203             /* FIXME: we should do multiple passes in case an audio type
 204              * is not present */
 205             for( i_es = 0;
 206                  i_es < p_input->stream.pp_programs[0]->i_es_number;
 207                  i_es++ )
 208             {
 209 #define p_es p_input->stream.pp_programs[0]->pp_es[i_es]
 210                 switch( p_es->i_fourcc )
 211                 {
 212                     case VLC_FOURCC('m','p','g','v'):
 213                         input_SelectES( p_input, p_es );
 214                         break;
 215
 216                     case VLC_FOURCC('m','p','g','a'):
 217                         if( config_GetInt( p_input, "audio-channel" )
 218                                 == (p_es->i_id & 0x1F) ||
 219                            ( config_GetInt( p_input, "audio-channel" ) < 0
 220                               && !(p_es->i_id & 0x1F) ) )
 221                         switch( config_GetInt( p_input, "audio-type" ) )
 222                         {
 223                         case -1:
 224                         case REQUESTED_MPEG:
 225                             input_SelectES( p_input, p_es );
 226                         }
 227                         break;
 228
 229                     case VLC_FOURCC('a','5','2',' '):
 230                         if( config_GetInt( p_input, "audio-channel" )
 231                                 == ((p_es->i_id & 0xF00) >> 8) ||
 232                            ( config_GetInt( p_input, "audio-channel" ) < 0
 233                               && !((p_es->i_id & 0xF00) >> 8) ) )
 234                         switch( config_GetInt( p_input, "audio-type" ) )
 235                         {
 236                         case -1:
 237                         case REQUESTED_A52:
 238                             input_SelectES( p_input, p_es );
 239                         }
 240                         break;
 241
 242                     case VLC_FOURCC('s','p','u',' '):
 243                         if( config_GetInt( p_input, "spu-channel" )
 244                                 == ((p_es->i_id & 0x1F00) >> 8) )
 245                         {
 246                             input_SelectES( p_input, p_es );
 247                         }
 248                         break;
 249
 250                     case VLC_FOURCC('l','p','c','m'):
 251                         if( config_GetInt( p_input, "audio-channel" )
 252                                 == ((p_es->i_id & 0x1F00) >> 8) ||
 253                            ( config_GetInt( p_input, "audio-channel" ) < 0
 254                               && !((p_es->i_id & 0x1F00) >> 8) ) )
 255                         switch( config_GetInt( p_input, "audio-type" ) )
 256                         {
 257                         case -1:
 258                         case REQUESTED_LPCM:
 259                             input_SelectES( p_input, p_es );
 260                         }
 261                         break;
 262                 }
 263 #undef p_es
 264             }
 265         }
 266 #endif
 267         input_DumpStream( p_input );
 268         vlc_mutex_unlock( &p_input->stream.stream_lock );
 269     }
 270     else
 271     {
 272         /* The programs will be added when we read them. */
 273         vlc_mutex_lock( &p_input->stream.stream_lock );
 274         p_input->stream.pp_programs[0]->b_is_ok = 0;
 275         vlc_mutex_unlock( &p_input->stream.stream_lock );
 276     }
 277
 278     return 0;
 279 }
 280
 281 /*****************************************************************************
 282  * Deactivate: deinitialize PS structures
 283  *****************************************************************************/
 284 static void Deactivate( vlc_object_t * p_this )
 285 {
 286     input_thread_t *    p_input = (input_thread_t *)p_this;
 287
 288     module_Unneed( p_input, p_input->p_demux_data->p_module );
 289     free( p_input->p_demux_data );
 290 }
 291
 292 /*****************************************************************************
 293  * Demux: reads and demuxes data packets
 294  *****************************************************************************
 295  * Returns -1 in case of error, 0 in case of EOF, otherwise the number of
 296  * packets.
 297  *****************************************************************************/
 298 static int Demux( input_thread_t * p_input )
 299 {
 300     int i;
 301
 302     for( i = 0; i < PS_READ_ONCE; i++ )
 303     {
 304         data_packet_t *     p_data;
 305         ssize_t             i_result;
 306         i_result = p_input->p_demux_data->mpeg.pf_read_ps( p_input, &p_data );
 307
 308         if( i_result <= 0 )
 309         {
 310             return i_result;
 311         }
 312
 313         p_input->p_demux_data->mpeg.pf_demux_ps( p_input, p_data );
 314     }
 315
 316     return i;
 317 }
 318